SRP (Secure Remote Password) cipher suites is another alternative to PKI for authentication;

standard and custom TLS extensions let you harness the power of TLS specification and include additional information to the handshake, if necessary;

with raw asymmetric keys for authentication (instead of X.509 certificates) you can avoid the necessity to deploy PKI infrastructure where it is not needed (in closed environments) and decrease handshake time;

possibility to secure any data channels (and not just TCP or UDP sockets) lets you secure any communication channel with TLS or DTLS;

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